Portable charging terminal

Abstract

A portable charging terminal includes a case, a power storage device, a charging interface, and a substrate. The case includes a power receiving wall and a charging wall. The power receiving wall and the charging wall define two planes of the case that face each other. The charging interface is configured to supply power from the power storage device to an external terminal. A power receiving antenna and a power receiving circuit are disposed on the substrate. The power storage device and the charging interface are arranged facing the charging wall. The substrate is arranged so that the power receiving antenna faces the power receiving wall. The power receiving antenna includes a circular polarized antenna element.

What is claimed is: 
     
         1 . A portable charging terminal, comprising:
 a case;   a power storage device;   a charging interface; and   a substrate, wherein   the case includes a power receiving wall and a charging wall,   the power receiving wall and the charging wall define two planes of the case that face each other,   the charging interface is configured to supply electric power from the power storage device to an external terminal,   a power receiving antenna disposed on the substrate is configured to receive electric power supplied to the power storage device, and a power receiving circuit disposed on the substrate is configured to charge the power storage device with electric power from the power receiving antenna,   the power storage device and the charging interface are arranged facing the charging wall,   the substrate is arranged so that the power receiving antenna faces the power receiving wall, and   the power receiving antenna includes a circular polarized antenna element.   
     
     
         2 . The portable charging terminal according to  claim 1 , wherein
 the circular polarized antenna is one of multiple circular polarized antenna elements disposed on a first main surface of the substrate, and   the multiple circular polarized antenna elements are disposed on the first main surface in rows, each including an n number of circular polarized antenna elements arranged at intervals in a lateral direction, and columns, each including an m number of circular polarized antenna elements arranged at intervals in a longitudinal direction, where m and n are integers greater than or equal to three, and m and n are equal to or unequal to each other.   
     
     
         3 . The portable charging device according to  claim 2 , wherein at least one of the multiple circular polarized antenna elements disposed on the first main surface of the substrate is oriented by 180 degrees, as determined by locations of a perturbation and a feed point, from one or both of an adjacent one of the circular polarized antenna elements in the longitudinal direction and an adjacent one of the circular polarized antenna elements in the lateral direction. 
     
     
         4 . The portable charging terminal according to  claim 2 , further comprising:
 a communication antenna used for communication with an external device, wherein   the communication antenna includes a circular polarized antenna element, and   the multiple circular polarized antenna elements arranged on the first main surface of the substrate includes the circular polarized antenna element of the power receiving antenna and the circular polarized antenna element of the communication antenna.   
     
     
         5 . The portable charging terminal according to  claim 4 , in a region of the first main surface of the substrate where the multiple circular polarized antenna elements are disposed, at least one of the multiple circular polarized antenna elements located closest to a center of the region is the circular polarized antenna element of the communication antenna. 
     
     
         6 . The portable charging terminal according to  claim 1 , wherein
 the substrate includes metal layers stacked in a thickness direction of the substrate, and an insulation layer arranged between the metal layers, and   a distance between the first main surface and one of the metal layers that is closest to the first main surface is greater than a distance between the metal layers.